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| United States Patent |
6,186,223
|
|
Bergh
, et al.
|
February 13, 2001
|
Corrugated folded plate heat exchanger
Abstract
An apparatus and method are described for thoroughly sealing off the
extreme ends of a corrugated folded plate (core) heat exchanger. Instead
of using end caps to seal off the two ends of the heat exchanger, the ends
are first compressed or "crushed" into a vertical seam, thereby maximizing
the density of the core. The crushed ends are then pinched and/or trimmed
and the seam is then welded closed. Another variation is to spin the ends
of the heat exchanger so that the ends taper to a very small opening while
also maximizing the density of the core. The small opening is then welded
shut.
| Inventors:
|
Bergh; Charles J. (Berwyn, PA);
McKee; Peter J. (Downingtown, PA)
|
| Assignee:
|
Zeks Air Drier Corporation (West Chester, PA)
|
| Appl. No.:
|
385493 |
| Filed:
|
August 27, 1999 |
| Current U.S. Class: |
165/165; 29/890.03; 165/157 |
| Intern'l Class: |
F28D 009/00 |
| Field of Search: |
165/164,165,DIG. 399,157
29/890.03
|
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Other References
Walas Chemical Process Equipment "Selection and Design" 1988 p. 434.
|
Primary Examiner: Flanigan; Allen
Attorney, Agent or Firm: Caesar, Rivise, Bernstein, Cohen & Pokotilow, Ltd.
Parent Case Text
RELATED APPLICATIONS
This application is CIP of U.S. application Ser. No. 09/315,096 filed May
19, 1999 entitled CORRUGATED FOLDED PLATE HEAT EXCHANGER APPARATUS (which
is assigned to the same Assignee of the present patent application,
namely, Zeks Air Drier Corporation), which, in turn, is based on U.S.
Provisional Patent Application No. 60/098,137 filed on Aug. 27, 1998, also
entitled CORRUGATED FOLDED PLATE HEAT EXCHANGER APPARATUS and all of whose
entire disclosures are incorporated by reference herein.
Claims
We claim:
1. A heat exchanger comprising:
an elongated housing having a first set of inlet and outlet ports for
circulating a first medium through said housing and a second set of inlet
and outlet ports for circulating a second medium through said housing,
said housing having an interior wall and two extreme ends;
a core comprising a continuous sheet having corrugations running angularly
to the direction of said sheet and wherein said sheet is folded such that
each of said folds is in contact with said interior wall to form
alternating isolated channels within said housing, said alternating
isolated channels comprising a first set of channels that is in fluid
communication with said first set of ports and a second set of channels
that is in fluid communication with said second set of ports, said first
and second media forming parallel flows within said respective sets of
channels, said continuous sheet comprising ends that are disposed at said
extreme ends; and
each of said extreme ends being compressed to maximize the density of said
core and to form a respective seam in said housing at each of said extreme
ends that is welded closed.
2. The heat exchanger of claim 1 wherein said compressed extreme ends form
projections that are pinched flat, trimmed away and sealed.
3. A heat exchanger comprising:
an elongated housing having a first set of inlet and outlet ports for
circulating a first medium through said housing and a second set of inlet
and outlet ports for circulating a second medium through said housing,
said housing having an interior wall and two extreme ends;
a core comprising a continuous sheet having corrugations running angularly
to the direction of said sheet and wherein said sheet is folded such that
each of said folds is in contact with said interior wall to form
alternating isolated channels within said housing, said alternating
isolated channels comprising a first set of channels that is in fluid
communication with said first set of ports and a second set of channels
that is in fluid communication with said second set of ports, said first
and second media forming parallel flows within said respective sets of
channels, said continuous sheet comprising ends that are disposed at said
extreme ends; and
each of said two extreme ends being tapered down to maximize the density of
said core and to form a reduced opening in said housing at each of said
extreme ends that is welded closed.
4. A method for providing a heat exchanger for supporting heat exchange
between two fluid media:
(a) providing a continuous sheet having corrugations running angularly to
the direction of the sheet, said continuous sheet having a first end and a
second end;
(b) providing a first elongated housing shell having a first set of input
and output ports for a first medium flow and a second elongated housing
shell having a second set of input and output ports for a second medium
flow, said shells having side edges for joining together to form a housing
having an interior wall and a hollow interior and wherein said housing
comprises two extreme ends;
(c) folding said continuous sheet, excluding the ends, into a plurality of
folds such that each one of said plurality of folds is in contact with
said interior wall when said folded sheet is positioned in said hollow
interior;
(d) positioning said folded continuous sheet into said first elongated
housing shell so that each one of said ends of said continuous sheet is
positioned on a respective side edge of said first elongated housing shell
and wherein said first and second ends of said folded continuous sheet are
coincident with a respective one of said two extreme ends;
(e) joining said second elongated housing shell to said first elongated
housing shell along their side edges;
(f) compressing each of said two extreme ends to maximize the density of
said folded continuous sheet and to form a seam in said housing at each of
said extreme ends; and
(g) welding each of said seams closed.
5. The method of claim 4 wherein said step of compressing each of said two
extreme ends further comprises pinching flat any projections formed by
said compressing step.
6. The method of claim 5 wherein said step of compressing each of said two
extreme ends further comprises trimming away said pinched flat
projections.
7. A method for providing a heat exchanger for supporting heat exchange
between two fluid media:
(a) providing a continuous sheet having corrugations running angularly to
the direction of the sheet, said continuous sheet having a first end and a
second end;
(b) providing a first elongated housing shell having a first set of input
and output ports for a first medium flow and a second elongated housing
shell having a second set of input and output ports for a second medium
flow, said shells having side edges for joining together to form a housing
having an interior wall and a hollow interior and wherein said housing
comprises two extreme ends;
(c) folding said continuous sheet, excluding the ends, into a plurality of
folds such that each one of said plurality of folds is in contact with
said interior wall when said folded sheet is positioned in said hollow
interior;
(d) positioning said folded continuous sheet into said first elongated
housing shell so that each one of said ends of said continuous sheet is
positioned on a respective side edge of said first elongated housing shell
and wherein said first and second ends of said folded continuous sheet are
coincident with a respective one of said two extreme ends;
(e) joining said second elongated housing shell to said first elongated
housing shell along their side edges;
(f) spinning each of said two extreme ends to taper down each of said two
extreme ends to a reduced opening while maximizing the density of said
folded continuous sheet; and
(g) welding each of said reduced openings closed.
Description
FIELD OF THE INVENTION
The present invention relates to heat exchangers and more specifically to
improvements in heat exchange devices.
BACKGROUND OF THE INVENTION
In heat exchangers where parallel or counter flow operation of two isolated
fluids (e.g., a refrigerant and air) is used, the inlet and outlet ports
of the heat exchanger for these flows are disposed inward of the extreme
ends of the heat exchanger vessel. Furthermore, where these heat
exchangers use internal parallel plates for performing the heat exchanging
between the flows, the ends of the plates are disposed at the ends of the
heat exchanger. Thus, it is very important that the extreme ends of the
heat exchanger vessel, including the plate ends, need to be thoroughly
sealed to maintain the isolation of the two fluids. Although end caps may
be brazed, or through-welded, to the ends of the heat exchanger to provide
thorough sealing, the dispersed plate ends do not provide a readily dense
surface to which the end caps can seal thoroughly. Thus, there remains a
need for an improved manner of thoroughly sealing the extreme ends of such
heat exchangers that maintains the requisite fluid isolation, that is more
resistant to internal pressure forces and that is more cost effective.
OBJECTS OF THE INVENTION
Accordingly, it is the general object of this invention to provide an
invention that overcomes the disadvantages of the prior art.
It is an object of the present invention to provide an apparatus and method
for thoroughly sealing the extreme ends of a corrugated folded heat
exchanger.
It is still yet a further object of the present invention to provide an
apparatus and method that thoroughly seals the extreme ends of a
corrugated folded heat exchanger in order to maintain the isolation of the
two heat exchanging fluids.
It is still yet another object of the present invention to provide an
apparatus and method that thoroughly seals the extreme ends of a
corrugated folded heat exchanger in order to improve the resistance to
internal pressure forces.
It is a further object of the present invention to provide an apparatus and
method that improves the quality of the sealing of the extreme ends of a
corrugated folded heat exchanger.
It is still yet another object of the present invention to provide an
apparatus and method that reduces the manufacturing costs for thoroughly
sealing the extreme ends of a corrugated folded heat exchanger.
It is a further object of this invention to provide an apparatus and method
that utilizes welding, rather than brazing, in order to thoroughly seal
the extreme ends of a corrugated folded heat exchanger.
It is still a further object of this invention to provide an apparatus and
method for maximizing the density of the corrugated folded core of the
heat exchanger in order to thoroughly seal the extreme ends of the heat
exchanger.
SUMMARY OF INVENTION
These and other objects of the instant invention are achieved by providing
a heat exchanger that comprises:(a) an elongated housing (e.g., stainless
steel, etc. that has a thickness to withstand high, internal pressure)
having a first set of inlet and outlet ports for circulating a first
medium (e.g., air) through the housing and a second set of inlet and
outlet ports for circulating a second medium (e.g., refrigerant) through
the housing and where the housing has an interior wall and two extreme
ends; and (b) a core comprising a continuous sheet (e.g., a
corrosion-resistant, temperature resistant, low cost material such as
stainless steel, titanium, etc.) having corrugations running angularly to
the direction of the sheet and wherein the sheet is folded such that each
of the folds is in contact with the interior wall to form alternating
isolated channels within the housing. The alternating isolated channels
comprise a first set of channels that is in fluid communication with the
first set of ports and a second set of channels that is in fluid
communication with the second set of ports and wherein the first and
second media form parallel flows within the respective sets of channels.
The continuous sheet comprises ends that are disposed at the extreme ends
of the housing and wherein each of the extreme ends are compressed to
maximize the density of the core and to form a respective seam in said
housing at each of said extreme ends that is welded closed.
These and other objects of the instant invention are also achieved by
providing a heat exchanger that comprises:(a) an elongated housing (e.g.,
stainless steel, etc. that has a thickness to withstand high, internal
pressure) having a first set of inlet and outlet ports for circulating a
first medium (e.g., air) through the housing and a second set of inlet and
outlet ports for circulating a second medium (e.g., refrigerant) through
the housing and where the housing has an interior wall and two extreme
ends; and (b) a core comprising a continuous sheet (e.g., a
corrosion-resistant, temperature resistant, low cost material such as
stainless steel, titanium, etc.) having corrugations running angularly to
the direction of the sheet and wherein the sheet is folded such that each
of the folds is in contact with the interior wall to form alternating
isolated channels within the housing. The alternating isolated channels
comprise a first set of channels that is in fluid communication with the
first set of ports and a second set of channels that is in fluid
communication with the second set of ports and wherein the first and
second media form parallel flows within the respective sets of channels.
The continuous sheet comprises ends that are disposed at the extreme ends
of the housing and wherein each of the extreme ends are tapered down to
maximize the density of the core and to form a reduced opening in said
housing at each of the extreme ends that is welded closed.
These and other objects of the instant invention are also achieved by
providing a method for providing a heat exchanger for supporting heat
exchange between two fluid media. The method comprises:(a) providing a
continuous sheet (e.g., a corrosion resistant, temperature resistant, low
cost material such as stainless steel, titanium, etc.) having corrugations
running angularly to the direction of the sheet and wherein the continuous
sheet has a first end and a second end; (b) providing a first elongated
housing shell having a first set of input and output ports for a first
medium flow and a second elongated housing shell having a second set of
input and output ports for a second medium flow and wherein the shells
(e.g., stainless steel, etc. that has a thickness to withstand high,
internal pressure) have side edges for joining together to form a housing
having an interior wall and a hollow interior and wherein the housing
comprises two extreme ends; (c) folding the continuous sheet, excluding
the ends, into a plurality of folds such that each one of the plurality of
folds is in contact with the interior wall when the folded sheet is
positioned in the hollow interior; (d) positioning the folded continuous
sheet into the first elongated housing shell so that each one of the ends
of the continuous sheet is positioned on a respective side edge of the
first elongated housing shell and wherein the first and second ends of the
folded continuous sheet are coincident with a respective one of the two
extreme ends; (e) joining (e.g., welding) the second elongated housing
shell to the first elongated housing shell along their side edges; (f)
compressing each of the two extreme ends to maximize the density of the
folded continuous sheet and to form a seam in the housing at each of the
extreme ends; and (g) welding each of the seams closed.
These and other objects of the instant invention are also achieved by
providing a method for providing a heat exchanger for supporting heat
exchange between two fluid media. The method comprises:(a) providing a
continuous sheet (e.g., a corrosion-resistant, temperature resistant, low
cost material such as stainless steel, titanium, etc.) having corrugations
running angularly to the direction of the sheet and wherein the continuous
sheet has a first end and a second end; (b) providing a first elongated
housing shell having a first set of input and output ports for a first
medium flow and a second elongated housing shell having a second set of
input and output ports for a second medium flow and wherein the shells
(e.g., stainless steel, etc. that has a thickness to withstand high,
internal pressure) have side edges for joining together to form a housing
having an interior wall and a hollow interior and wherein the housing
comprises two extreme ends; (c) folding the continuous sheet, excluding
the ends, into a plurality of folds such that each one of the plurality of
folds is in contact with the interior wall when the folded sheet is
positioned in the hollow interior; (d) positioning the folded continuous
sheet into the first elongated housing shell so that each one of the ends
of the continuous sheet is positioned on a respective side edge of the
first elongated housing shell and wherein the first and second ends of the
folded continuous sheet are coincident with a respective one of the two
extreme ends; (e) joining (e.g., welding) the second elongated housing
shell to the first elongated housing shell along their side edges; (f)
spinning each of the two extreme ends to taper down each of the two
extreme ends to a reduced opening while maximizing the density of the
folded continuous sheet; and (g) welding each of the reduced openings
closed.
DESCRIPTION OF THE DRAWINGS
Other objects and many of the attendant advantages of this invention will
be readily appreciated as the same becomes better understood by reference
to the following detailed description when considered in connection with
the accompanying drawings wherein:
FIG. 1 is an end view of the corrugated folded heat exchanger depicting a
first embodiment of the end closure of the pressure vessel;
FIG. 2 is a side view of the corrugated folded heat exchanger depicting the
first embodiment of the end closure of the pressure vessel;
FIG. 3 is an end view of the corrugated folded heat exchanger depicting a
second embodiment of the end closure of the pressure vessel;
FIG. 4 is a side view of the corrugated folded heat exchanger depicting the
second embodiment of the end closure of the pressure vessel;
FIG. 5 is an end view of the corrugated folded heat exchanger depicting a
third embodiment of the end closure of the pressure vessel; and
FIG. 6 is a side view of the corrugated folded heat exchanger depicting the
third embodiment of the end closure of the pressure vessel.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The improvement described in this application is directed to the end
closure of corrugated folded plate heat exchanger 120 of A.Ser. No.
09/315,096. In particular, three embodiments of the end closure are
described herein, namely, a first embodiment end closure 700 (FIGS. 1-2),
a second embodiment end closure 800 (FIGS. 3-4) and a third embodiment end
closure (FIGS. 5-6).
As described in A.Ser. No. 09/315,096, the heat exchanger 120 basically
comprises a pressure vessel 124 in which there is disposed a single,
folded and corrugated sheet known as the "core" 122, a portion of which
can seen in FIG. 1. The pressure vessel 124 comprises a pair of shells
134/136 that are welded together, as indicated by side seam 138. As also
discussed in A. Ser. No. 09/315,096, the pressure vessel 124 comprises two
sets of inlet and outlet ports: one set for a first fluid flow, e.g.,
refrigerant, and one set for a second fluid flow, e.g., air. FIG. 1 shows
one inlet port 144A of the first set and one outlet port 146B of the
second set that provide access to the core 122. The two ends (only one
which is shown in FIG. 2) of the pressure vessel 124 therefore need to be
tightly sealed off. As also described in A. Ser. No. 09/315,096, these
ends are sealed off with end caps (not shown) that are secured to the ends
of the core 122 via an internal braze joint (e.g., nickel) or via a
plurality of through-welds from the exterior wall of the end caps to the
end of the core 122.
One improvement to these types of end caps is shown by the first embodiment
700 in FIGS. 1-2. In particular, each end (only one of which is shown in
FIGS. 1-2) of the pressure vessel 124 is first compressed or "crushed" to
form a vertically-oriented seam, indicated by the line 702. By compressing
the ends of the pressure vessel 124 is such a manner, the core 122 itself
is compressed to its maximum density as shown by reference number 704. The
crushed end(s) of the pressure vessel 124 forms a "fish-tail" appearance
(also known as "projections") indicated by reference number 706. Once
compressed into this "fish-tail" condition, the excess shell material is
pinched flat and trimmed to obtain a flat surface on the core 122 and
vessel 124, as indicated by reference number 708. Next, metal is welded
onto the dense, flat end surface as indicated by the reference number 710
to seal the end(s) of the pressure vessel 124 against the internal
pressure.
The second embodiment 800 of this end closure is shown in FIGS. 3-4. In
particular, the ends (only one of which is shown) of the pressure vessel
124 are again compressed or "crushed" as in the first embodiment 700,
thereby crushing the core 122 to its maximum density 804 also. However, in
this case, the projections that form the "fish-tail" appearance (706, FIG.
1) in the first embodiment 700 are removed and welded shut as indicated by
reference number 812. As with the first embodiment 700, the vertical seam
indicated by reference number 802 (FIG. 3) is also welded shut as
indicated by reference number 810 (FIG. 4).
The third embodiment 900 of this end closure is shown in FIGS. 5-6. In
particular, the ends (only one of which is shown) of the pressure vessel
124 are "spun" to taper (indicated by reference number 906) the ends of
the pressure vessel 124 so that the ends taper to a very small opening 914
while also compressing or crushing the core 122 to its maximum density
904. Once the maximum density 904 is achieved the small opening(s) 914 is
welded closed, as indicated by reference number 910.
Each of the above embodiments has the advantages of eliminating the need
for end caps, improving the resistance to pressure forces, having seals
formed by welding rather than brazing and reducing manufacturing costs.
Without further elaboration, the foregoing will so fully illustrate our
invention that others may, by applying current or future knowledge,
readily adopt the same for use under various conditions of service. Even
though particular embodiments of the invention have been illustrated and
described herein, it is not intended to limit the invention and changes
and modifications may be made therein within the scope of the following
claims:
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